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Short-term transcriptomic response to plasma membrane injury.

Swantje Christin Häger1, Catarina Dias1, Stine Lauritzen Sønder1

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Plasma membrane injury triggers a rapid transcriptional response involving immediate-early genes, MAPK cascades, and immune pathways. This study reveals a conserved, overlooked regeneration phase influencing cellular status post-wounding.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genomics

Background:

  • Plasma membrane repair is crucial for cell survival, occurring rapidly post-injury.
  • The subsequent regeneration phase and early cellular transcriptional responses remain less understood.

Purpose of the Study:

  • To investigate the genome-wide mRNA expression profile of MCF-7 breast cancer cells following plasma membrane injury.
  • To characterize the early transcriptional signature and identify key molecular pathways involved in the regeneration phase.

Main Methods:

  • Genome-wide mRNA expression profiling of MCF-7 cells treated with digitonin (a plasma membrane permeabilizer).
  • Time-course analysis of gene expression at 20, 40, and 60 minutes post-injury.
  • Pathway analysis to identify enriched biological processes.

Main Results:

  • A time-dependent increase in differentially expressed genes was observed post-injury.
  • A three-part transcriptional response was identified: immediate-early genes, MAPK cascades, and inflammatory/immune pathways.
  • The study found a conserved transcriptome response to plasma membrane injury across different cell and injury types.

Conclusions:

  • Plasma membrane injury induces a rapid and robust stress and immunogenic transcriptional response.
  • The regeneration phase following membrane resealing involves significant transcriptome alterations.
  • These findings highlight a previously overlooked aspect of cellular injury response with potential implications for cellular status.